Grinding-mill



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Grinding Mill. No. 237,793. Patented Feb. 15,1881.

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A. N.4 WGLF. Grinding Mill..

No. 237,793. Patented Feb. 15,1881.

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PATENT ABRAHAM N. WOLF, OF ALLENTOWN, PENNSYLVANIA.

eRlNDlNG-MILL.

SPECIFICATION formingpart of Letters Patent No. 237,793, dated February 15, 1881.

Application filed December 16, 1880. (No model.)

To all whom t may concern.'

Be it known that l, A. N. 'WOLI+,-of Allentown, in the county of. Lehigh and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Mills; and

I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in grinding-mills; and it consists, rst, in the combination of a spindle having a 4loose ball placed upon its top, and having an enlargement just below its upper end, with a bail, which iits down over the top of the spindle and rests upon the ball and bears against the sides of the enlargement g second, in regulating the pressure of the upper stone upon the lower one by means of a lever, a counterweight, and a hand-wheel which bears upon the top of the lever, as will be more fully described hereinafter. l

Figure l is a plan view of a mill embodying my invention. Fig. 2 is a vertical section of the same. Figs. 3, 4, and 5 are detail views of the spindle, driver, and bail.

A represents the spindle, which has a recess, B, formed in its upper end, and in this recess is placed a ball, C, which forms the support for the bail D, and through the bail for the running stone E. This ball rolls around upon the top of the spindle, and as the bearingpoints are very sm all the stone runs with much less friction, and the spindle can get out of true without affecting the level ofthe running stone. The ball, being in the recess, can never be displaced while the runner-stone is in position.

Formed upon the spindle inside of the bail is the enlargement F, which forms a side bearing for the hail close to the face of the stone, and which serves to steady the bail in position and prevent any vibration or rocking of the stone while in operation. The driver G projects out from opposite sides of the spindle on a line with this enlargement, and the inside edges of the bail are made curved where they come in contaet'with the driver, as shown in Fig. 3.

sides, are passed the supporting-screws J,

which pass into the sides of the tube L, by which the stone is supported. This lever H may be formed in a single piece, if so preferred, but is here formed in two pieces, as shown in Fig. 1, and which are pivoted together in such a manner that they can be freely opened out-v ward like a pair of scissors when it is desired to detach them from the tube. Upon the outer end of thislever is suspended a counter-weight, N', which automatically adjusts the pressure of the upper'stone, N, upon the lower one; also used in connection with this lever is a hand-wheel, O, which serves to regulate the distance the outer end of the lever shall rise upward, and thus prevent the stone from sinking too far down. The upper stone, being suspended upon the two pivotal points, is free to accommodate itself to every movement of the runner-stone, and when the spindle expands or contracts'from heat or cold the upper stone either rises or falls with the lower one. By means of this adjustment the pressure of the upper stone upon the top of the lower one is always uniform, and hencel the yield of Hour is always of the best quality.

The hopper Q is placed upon the top of the tube L and discharges the grain down through it to the center of the two stones, as shown in Fig. 2.

Having thus described my invention, I claim- 1. The combination of the spindle having the enlargement formed upon it inside of the bail with the bail and a loose ball, which forms the bearing for the runner-stone, substantially as set forth.

2. The lever H, formed in two parts, which IOO are pivoted together, and each part provided l 2 :remesas with a pivoting-screw, in combination with a have hereunto set my hand this 11th day ot tube, L, and the upper sto11e,substautiai1y as December, 1880.v shown.

3. The Combination of the lever H, the upper stone pivoted thereon, a counter-Weight, and the hand-Wheel, substuutiallyas described.

Ill testimony that I claim the foregoing` I ABRAHAM N. WOLF.

Tituesses JOSEPH BARBER, E. J. LUMLEY. 

